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        <h1 id="Java8-LocalDateTime记录"><a href="#Java8-LocalDateTime记录" class="headerlink" title="Java8-LocalDateTime记录"></a>Java8-LocalDateTime记录</h1><p>文中都使用的时区都是东8区，也就是北京时间。这是为了防止服务器设置时区错误时导致时间不对，如果您是其他时区，请自行修改。</p>
<h2 id="关键类介绍"><a href="#关键类介绍" class="headerlink" title="关键类介绍"></a>关键类介绍</h2><p>– Instant:它代表的是时间戳<br>– LocalDate:不包含具体时间的日期，比如2019-08-28。它可以用来存储生日，周年纪念日，入职日期等。<br>– LocalTime:它代表的是不含日期的时间<br>– LocalDateTime:它包含了日期及时间，不过还是没有偏移信息或者说时区。<br>– ZonedDateTime:这是一个包含时区的完整的日期时间，偏移量是以UTC/格林威治时间为基准的。</p>
<h2 id="Java8新增的DateTimeFormatter与SimpleDateFormat的区别"><a href="#Java8新增的DateTimeFormatter与SimpleDateFormat的区别" class="headerlink" title="Java8新增的DateTimeFormatter与SimpleDateFormat的区别"></a>Java8新增的DateTimeFormatter与SimpleDateFormat的区别</h2><p>两者最大的区别是，Java8的DateTimeFormatter是线程安全的，而SimpleDateFormat并不是线程安全。</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">import</span> java.text.DateFormat;</span><br><span class="line"><span class="keyword">import</span> java.text.SimpleDateFormat;</span><br><span class="line"><span class="keyword">import</span> java.time.LocalDate;</span><br><span class="line"><span class="keyword">import</span> java.time.LocalDateTime;</span><br><span class="line"><span class="keyword">import</span> java.time.format.DateTimeFormatter;</span><br><span class="line"><span class="keyword">import</span> java.util.Date;</span><br><span class="line"></span><br><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">Main</span> </span>&#123;</span><br><span class="line"></span><br><span class="line">    <span class="function"><span class="keyword">public</span> <span class="keyword">static</span> <span class="keyword">void</span> <span class="title">main</span><span class="params">(String args[])</span></span>&#123;</span><br><span class="line"></span><br><span class="line">        <span class="comment">//解析日期</span></span><br><span class="line">        String dateStr= <span class="string">&quot;2016年10月25日&quot;</span>;</span><br><span class="line">        DateTimeFormatter formatter = DateTimeFormatter.ofPattern(<span class="string">&quot;yyyy年MM月dd日&quot;</span>);</span><br><span class="line">        LocalDate date= LocalDate.parse(dateStr, formatter);</span><br><span class="line"></span><br><span class="line">        <span class="comment">//日期转换为字符串</span></span><br><span class="line">        LocalDateTime now = LocalDateTime.now();</span><br><span class="line">        DateTimeFormatter format = DateTimeFormatter.ofPattern(<span class="string">&quot;yyyy年MM月dd日 hh:mm a&quot;</span>);</span><br><span class="line">        String nowStr = now .format(format);</span><br><span class="line">        System.out.println(nowStr);</span><br><span class="line"></span><br><span class="line">        <span class="comment">//ThreadLocal来限制SimpleDateFormat</span></span><br><span class="line">        System.out.println(format(<span class="keyword">new</span> Date()));</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    <span class="comment">//要在高并发环境下能有比较好的体验，可以使用ThreadLocal来限制SimpleDateFormat只能在线程内共享，这样就避免了多线程导致的线程安全问题。</span></span><br><span class="line">    <span class="keyword">private</span> <span class="keyword">static</span> ThreadLocal&lt;DateFormat&gt; threadLocal = <span class="keyword">new</span> ThreadLocal&lt;DateFormat&gt;() &#123;</span><br><span class="line">        <span class="meta">@Override</span></span><br><span class="line">        <span class="function"><span class="keyword">protected</span> DateFormat <span class="title">initialValue</span><span class="params">()</span> </span>&#123;</span><br><span class="line">            <span class="keyword">return</span> <span class="keyword">new</span> SimpleDateFormat(<span class="string">&quot;yyyy-MM-dd HH:mm:ss&quot;</span>);</span><br><span class="line">        &#125;</span><br><span class="line">    &#125;;</span><br><span class="line"></span><br><span class="line">    <span class="function"><span class="keyword">public</span> <span class="keyword">static</span> String <span class="title">format</span><span class="params">(Date date)</span> </span>&#123;</span><br><span class="line">        <span class="keyword">return</span> threadLocal.get().format(date);</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>

<h2 id="LocalDateTime获取毫秒数"><a href="#LocalDateTime获取毫秒数" class="headerlink" title="LocalDateTime获取毫秒数"></a>LocalDateTime获取毫秒数</h2><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">//获取秒数</span></span><br><span class="line">Long second = LocalDateTime.now().toEpochSecond(ZoneOffset.of(<span class="string">&quot;+8&quot;</span>));</span><br><span class="line"><span class="comment">//获取毫秒数</span></span><br><span class="line">Long milliSecond = LocalDateTime.now().toInstant(ZoneOffset.of(<span class="string">&quot;+8&quot;</span>)).toEpochMilli();</span><br></pre></td></tr></table></figure>

<h2 id="LocalDateTime与String互转"><a href="#LocalDateTime与String互转" class="headerlink" title="LocalDateTime与String互转"></a>LocalDateTime与String互转</h2><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">//时间转字符串格式化</span></span><br><span class="line"> DateTimeFormatter formatter = DateTimeFormatter.ofPattern(<span class="string">&quot;yyyyMMddHHmmssSSS&quot;</span>);</span><br><span class="line"> String dateTime = LocalDateTime.now(ZoneOffset.of(<span class="string">&quot;+8&quot;</span>)).format(formatter);</span><br><span class="line"></span><br><span class="line"><span class="comment">//字符串转时间</span></span><br><span class="line">String dateTimeStr = <span class="string">&quot;2018-07-28 14:11:15&quot;</span>;</span><br><span class="line">DateTimeFormatter df = DateTimeFormatter.ofPattern(<span class="string">&quot;yyyy-MM-dd HH:mm:ss&quot;</span>);</span><br><span class="line">LocalDateTime dateTime = LocalDateTime.parse(dateTimeStr, df);</span><br></pre></td></tr></table></figure>

<h2 id="Date与LocalDateTime互转"><a href="#Date与LocalDateTime互转" class="headerlink" title="Date与LocalDateTime互转"></a>Date与LocalDateTime互转</h2><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">//将java.util.Date 转换为java8 的java.time.LocalDateTime,默认时区为东8区</span></span><br><span class="line"><span class="function"><span class="keyword">public</span> <span class="keyword">static</span> LocalDateTime <span class="title">dateConvertToLocalDateTime</span><span class="params">(Date date)</span> </span>&#123;</span><br><span class="line">    <span class="keyword">return</span> date.toInstant().atOffset(ZoneOffset.of(<span class="string">&quot;+8&quot;</span>)).toLocalDateTime();</span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line"><span class="comment">//将java8 的 java.time.LocalDateTime 转换为 java.util.Date，默认时区为东8区</span></span><br><span class="line"><span class="function"><span class="keyword">public</span> <span class="keyword">static</span> Date <span class="title">localDateTimeConvertToDate</span><span class="params">(LocalDateTime localDateTime)</span> </span>&#123;</span><br><span class="line">    <span class="keyword">return</span> Date.from(localDateTime.toInstant(ZoneOffset.of(<span class="string">&quot;+8&quot;</span>)));</span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line"><span class="comment">/**</span></span><br><span class="line"><span class="comment"> * 测试转换是否正确</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"><span class="meta">@Test</span></span><br><span class="line"><span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">testDateConvertToLocalDateTime</span><span class="params">()</span> </span>&#123;</span><br><span class="line">    Date date = DateUtils.parseDate(<span class="string">&quot;2018-08-01 21:22:22&quot;</span>, DateUtils.DATE_YMDHMS);</span><br><span class="line">    LocalDateTime localDateTime = DateUtils.dateConvertToLocalDateTime(date);</span><br><span class="line">    Long localDateTimeSecond = localDateTime.toEpochSecond(ZoneOffset.of(<span class="string">&quot;+8&quot;</span>));</span><br><span class="line">    Long dateSecond = date.toInstant().atOffset(ZoneOffset.of(<span class="string">&quot;+8&quot;</span>)).toEpochSecond();</span><br><span class="line">    Assert.assertTrue(dateSecond.equals(localDateTimeSecond));</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
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